DILUTE SOLUTIONS AT THE FREEZING POINT. 



345 



TABLE III. Barium Chloride. BaClj = 104'1. 

 July 31, 1899. Solvent, W = 219'42. R = 41 160. 



July 30 and 31. Solvent, W = 219'42. R = 33370. 



Copper Sulphate. Recrystallised salt CuSo 4 .5H 2 O, supplied by KAHLBAUM, of 

 Berlin, as free from iron, was used. 



6'6440 grammes of salt dissolved in 130'67 grammes of solution gave a concentra- 

 tion of 4 '072 X 10~* gramme-equivalent per gramme of solution. 



From this, solution (b) was prepared, with a concentration of 5 '947 gramme- 

 equivalent per gramme of solution. 



The same solutions (a) and (b) were used four days later for the experiments 

 at 18. Solution (b) was weighed after and before use in order to estimate any loss 

 of weight by evaporation or from other causes. The loss observed, '01 in 37 '38 

 grammes of solution, was negligible. 



TABLE IV. Copper Sulphate, CuSO 4 .5HjO = 124'87. 

 At 0. January 15, 1900. Solvent, W = 219'44. R = 33932. 



VOL. CXCIV. A. 



2 Y 



